Abstract
The effect of the postmenopausal state on serum calcitriol levels was studied in 13 normal premenopausal women and 10 normal postmenopausal women under basal conditions and during seven days of dietary calcium deprivation. Calcitriol levels and the free calcitriol index were lower in the postmenopausal women, and this difference persisted during calcium deprivation. One of the major actions of calcitriol is to increase gut calcium absorption. Relative calcitriol deficiency, despite retained renal synthetic reserve, would in part explain the increased dietary calcium requirement to maintain calcium balance in postmenopausal women.
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